Reduce some of GCC 7's nagging

Add fallthrough comments to tinyformat.hpp to disable
-Wimplicit-fallthrough warnings.

Also disable -Wattributes in embree, since it generates a lot of
warnings from that.

Author: CounterPillow

src/thirdparty/embree/common/cmake/gcc.cmake

@@ -24,7 +24,7 @@ SET(FLAGS_AVX2  "-mf16c -mavx2 -mfma -mlzcnt -mbmi -mbmi2")
 SET(FLAGS_AVX512KNL "-mavx512f -mavx512pf -mavx512er -mavx512cd")
 SET(FLAGS_AVX512SKX "-mavx512f -mavx512dq -mavx512cd -mavx512bw -mavx512vl")
 
-SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fPIC -std=c++11 -fvisibility-inlines-hidden -fvisibility=hidden -fno-strict-aliasing -Wno-misleading-indentation -Wno-parentheses -Wno-unused-variable -Wno-unused-but-set-variable -Wno-sign-compare -Wno-maybe-uninitialized -Wno-terminate")
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fPIC -std=c++11 -fvisibility-inlines-hidden -fvisibility=hidden -fno-strict-aliasing -Wno-misleading-indentation -Wno-parentheses -Wno-unused-variable -Wno-unused-but-set-variable -Wno-sign-compare -Wno-maybe-uninitialized -Wno-terminate -Wno-attributes")
 SET(CMAKE_CXX_FLAGS_DEBUG          "-DDEBUG  -DTBB_USE_DEBUG -g -O0")
 SET(CMAKE_CXX_FLAGS_RELEASE        "-DNDEBUG                    -O3")
 SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-DDEBUG  -DTBB_USE_DEBUG -g -O3")

src/thirdparty/tinyformat/tinyformat.hpp

@@ -704,23 +704,27 @@ inline const char* streamStateFromFormat(std::ostream& out, bool& spacePadPositi
             break;
         case 'X':
             out.setf(std::ios::uppercase);
+            // fallthrough
         case 'x': case 'p':
             out.setf(std::ios::hex, std::ios::basefield);
             intConversion = true;
             break;
         case 'E':
             out.setf(std::ios::uppercase);
+            // fallthrough
         case 'e':
             out.setf(std::ios::scientific, std::ios::floatfield);
             out.setf(std::ios::dec, std::ios::basefield);
             break;
         case 'F':
             out.setf(std::ios::uppercase);
+            //fallthrough
         case 'f':
             out.setf(std::ios::fixed, std::ios::floatfield);
             break;
         case 'G':
             out.setf(std::ios::uppercase);
+            //fallthrough
         case 'g':
             out.setf(std::ios::dec, std::ios::basefield);
             // As in boost::format, let stream decide float format.
@@ -1036,4 +1040,4 @@ TINYFORMAT_FOREACH_ARGNUM(TINYFORMAT_MAKE_FORMAT_FUNCS)
 
 } // namespace tinyformat
 
-#endif // TINYFORMAT_H_INCLUDED
+#endif // TINYFORMAT_H_INCLUDED